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- c. M. READ SLUG FOB CLEANING GASTINGS Filed March 1926 CUTTING EDGE OF SHEA R-BLADE INVENTOR ATTORNEY Patented Aug. 28, 1928.

UNITED STATES CLYDE M. READ, OF HOLLYWOOD, FLORIDA.

SLUG FOR CLEANING CASTINGS.

I Applicationv filed March 3, 1926. Serial No. 92,018.

This invention relates to improvements l gether with the accompanying drawings, is sufficiently full, clear and exact to enableothers skilled in the arts to which its construction and use respectively relate, to make and use the same.

In the manufacture of-my improved slugs, they are sheared, or otherwise severed, from rolled bars or rods having an angular cross section, and which have been twisted after rolling.

One well-known form of such bar is shown upon page 124, of the 19th edition, date Januar 1,1917, of the Pocket Companion, pub ished by Carnegie Steel Company, Pittsburgh, Pennsylvania.

twisted square bars, ranging in sizes from one-quarter of an inch square, up to two inches square, are a commercial product.

Referring'now to the drawings:

Fig. 1 is an end view of a square twisted bar, which is the preferred form of bar used in making my improved slugs.

Fig. 2 is a side elevation of the bar shown in Fig. 1.

Fig. 3 is an end view of a slug formed from a square, twisted steel bar, like that shown in Figs, 1 and 2.

Fig. 4 is a side view of the slug shown in Fig. 8.

Fig. 5 is an end view of a triangular, twisted .bar, I

Fig. 6 is an end view of a twisted bar having an oblong, rectangular cross section,

Fig. 7 is an end view of a twisted bar hav- 50 ing a hexagonalcrossrsection, all of which sections are suitable for the manufacture of my improved slugs.

Fig. 8 is a view'intended to illustrate the point that, in shearing my, improved slugs 55 from the bar, said bar is, preferably, posi- 'turned in co-ordination or harmony with It is shown in said publication that .cold' tioned with its longitudinal axis at an angle to the cutting edge of the shear-blade.

Referring especially to said Fig. 8, it is explained that the reason for said angular disposition of the-bar 1 to the cutting edge 2 of the shear-blade is, to cause the severed faces 3, 4, of the slugs to be angularly disposed, both to the longitudinal axis of the slug and to the helical, sinuous angles, and to the lateral, circumferential faces thereof, such as the angles or corners 5 and the faces 6, since it is the multiplicity of variously and differently-disposed angles, corners and faces, together with the sinuous, helical, characteristics thereof which impart to my improved slugs their peculiarly efficient impinging, glancing, sand-removing, cleaning and smoothing action upon the castings with which they are tumbled.

In the process of shearing my improved slugs from the twisted bar, when the baris disposed at said angle to the cutting edge of the shear-blade, each time said bar 1 is fed forward for a new cut, it is, preferably,

the lead of the screw-like or twisted characteristic of the bar, as though said bar were passing through afixed nut formed to cooperate therewith; this revolving movement causes the sheared or severed facesof theslug to be differently disposed,rotatively considered-so that said faces are disposed at an angle to each other, instead of being parallel, as they would be, were the bar not rotated at each forward feed movement thereof.

I have found, in the actual use of my improved slugs, that the most efiicient length of same, is equal to one and one-quarter times the diameter of the slug, or the bar from which it is severed.

It is now a fairly uniform practice with the mills which manufacture twisted barsof angular cross section, to make the lead of the twist equal to either ten or twelve diameters, of the bar. This statement is made for the purpose of indicating in a general way,.the degree of angularity of the sheared faces of the slug and the relative position of their respective planes, rotatively of the slug. However, since: a fairly efficient slug may be made without imparting a rotative movement to the bar in feeding same to the shear, I do not wish to beunderstood as confining myself to a Slug that is made by the iq employment of such rotative movement only.

various cross sections of forms of't'wisted bars that I consider well adapted for use in the manufacture of my improved slugs. It will be noted that all of these forms have angular cross sections, as distinguished from round, oval or other non-angular forlns' By an inspection of the drawings it will be readily noted that all the shapes showntherein are polygons, that is to say, the faces of said shapes are straight, flat faces, and the meeting points of said faces are angles.

I claim the following: A

1. Slugs for use in cleaning castingsbonsisting of pieces severed from twisted metallic "bars having an angular cross-section, the severed faces oi said slugs being disposed at an angle other than 90 to the longitudinal axis of the slug.

2. Slugs for use in cleaning castings consisting of pieces severed from a twisted bar having an angular cross-section, thet severed faces of said slugs being disposed at an angle to eachother and at an angle other than 90 to the longitudinal axis of the slug.

3. Slugs for use in cleaning castings consisting of oblon metallicieces of a cross section havin' t e shape 0? a regular polygon and win ing, *helically-disposed lateral, circumferential faces, and their end faces disposed at an angle to'each other and at an angle other than 90- to the longitudinal axis of the slug.

4. Slugsfor use in cleaning castings con sisting of pieces sheared from a bar of meta] having the cross-sectional shape of a regular polygon, the sheared faces being disposed at an angle of other than 90 to the axis of the bar. In testimony whereof afiix my signature.

CLYDE M. READ. 

